Winding- machine and process



WINDING MACHINE AND PROCESS OF BENDING STRIP MATERIAL Jan. 10, 1928.

W. C. FURNAS WINDING MACHINE AND PROCESS OF BENDING STRIP MATERIAL FiledJan.14. 1924 2 Sheets-Sheet 2 Paie-nad Jan, 1o, 192s.

UNITED STATES ra'rsu'r orifice..

WEILLIAM C. FURNAS, 0l? WEST ALLIS, "il/"ISCOlltlSllil',` ASSIGNOR '10ALLIS-CHALMERS MANUFACTURNG CMPANSL', OF MILUVA'K'EE, WISONEIN, .ACOBPORATON 0F DELAWARE.

WINDING MACEIINE .iiND PRGCESS F BENDING STRIP MATERIAL.

Application filed January 14, 1924:.

This invention relates in general to the art of metal bending, and hasmore particular relation to bendingr strip material edgeivise, as forthe purpose of forming coils such as are of special utility aselectromagnet `coils for dynamo-.electric machines and otherwise.- v

ln bending strip material, especially nia terial of large size, in anedgewise manner, there is a crowding over or enlargement of the materialadjacent the inner edge of the bend anda tendency toward stretching orreduction of the thickness or crosssection of the material adjacent theouter edge of the bend. There it is necessary or desirable to preservesubstantially uniform thickness of the material throughout, as isespecially de sirable in the case of electromagnet coils formed fromstrip material bent or Wound edgevvise, this enlargement at the inneredge of the bend is a decided disadvantage, since it requires a furtheroperation to reduce or reform the enlarged Wedge-shaped section usuallya grinding, cutting or svvaging operation independent of the bendingoperation.

The crowdingr or enlarging, of the crosssection at the inner edge of thebent strip material is especially objectionable in electromagnet coils,especially field coils for dynamo-electric machines, for, unlessremoved, the over-alleine of such a coil is unduly increased. lt hasbeen commercial practice in the past, in the formation of coils of largesize, to first bend the material to form the complete coil and thenseparate the turns of the coil and to grind or swage the enlarnfcdportions at the inner edge of the bend of the individual turnssuccessively, the individual turns being later pressed baclr into thedesired coil formation of'as small axial dimension as possible. These opcrations of reducingr to desired size the material at the inner edge ofthe bend and the subsequent reforming of' the coil are per formed atgreat expense and delay.

The present invention is related to and, as to features concerned withthe bending and removal of excess thickness from a bent p0rtion of thematerial` constitutes an improvement upon the invention of theapplication of G. F. Johnston, Serial No. 685,946, filed January ill,i994.

Serial No. 685,945.

Features et the present invention contemplate the production of objectsformed from bent strip material, especially objects formed from materialof relatively great size as to thickness or Width, and wherein theexcess thickness of material at the inner edge of bends is removedduring,- the bending opera tion, this operation of removing the excessmaterial beingdirectly associated with the opent-ion of bending thematerial, `and the operations being successive and continuous. A furtherfeature of the invention conteur plates and includes an apparatusautomatically operative to form bends, especially a series of bends asfeatures of a coil., and to remove excess material from the inner edge`of the bends, the combined operations of bending and reducing; the bentor coiled material to the desired final shape being per formed at a.considerably reduced cost and in considerably less time than is requiredfor the several operations of bending and trimming the material at thebend, as practiced in the past. v

An object of the present invention is to provide an improved method andapparatus especially adapted for producing;r bent strip materiallwherein excess thickness formed at the inner side of the bend isreduced through an operation directly associated with the bending;operation.

It is a further object of the present invention to provide an improvedmethod and apparatus especially adapted for the pro duction of objectsformed from strip ma terial bent or coiled edgevvise and in accordancewith which the material may be bent and all of the excess thickness at`the inner side of the bend may be reduced during the bending operationor a continuation thereof. It is a further object of this invention toprovide an in'iproved apparatus for forminn edgewise wound coils,wherein the material to be Wound is fed to a rotatable form, and bendingand cutting devices are operable simultaneously with and relative to theform for the purpose of bending;r the material and removingy therefromexcess thickness at the inner edge of the bent portions.

These and other objects and advantages are attained. by the presentinvention, various novel features of which will be apparent :from thedescription and draivincs herein,

disclosing an embodiment of the invention, and will be more particularlypointed out in the claims.

In the, accompanying drawings: Fig. lis a iront elevation of a coilWindin g apparatus embodying eaturesof the present invention;

Fig. 2 is a Vhorizontal section through the axis'of the machine as shownin Fig. l;

Fig. 3 is an end elevation of the apparatus of Fig. l

Y'resl'i'ectiveljy, of a clamping.deviceforining a further detail of theapparatus ot F ig. l; Figs. 9, l0, l1, and 12a-re diagrammatic viewsshovvinglthe relative positions et cooperative parts of the apparatus otl, during thenori'nal operation ot such appa.-

- ratu's; and i Figui-13 is al diagrammatic view showing a detail of thecontrol o'l' the apparatus ot y 1 Fig. l'.

. In accordance livith the disclosure ol" the drawings, a'frame orsupport l0 is provided With suitable bearings 'for a shaft 12 which Vhaskeyed, or votherwise secured, to an end `thereof aV rotatable carrier orsupport lil, a

hub portion 14 of the latter bearing upon the shaftand constituting themeans or' support and attachi'nent of the carrier to the shaft. Thehubportion le is rotatable Within a, stationai'ygear 15the latter beingheld against movement by means oian arm 16' secured to a hub portion ofthe gear anda rod l? attached to the outer end of the arni and to afixed point of support, such as the traine fl0'. A forni 19 in the shapeof an elongated spool about which strip Vmaterial is to be bent or Woundtok forniturns ot a coil of the type which may loe used for anelcctri'iina'gnet, such as the field coil of a dynamo-electric machine,is provided with asini-circular ends "2l about which the strip materialis to be bent, andside portions having lflanges at their inner edges,these flanges constituting 'means forl attaching the form or supportingspool to the oiiteritace of 'the rotatable carrier 13.'

VpliiralityT of cli'slr-shaped elements oi' forming .blocks'25 aredisposed at the ends oi' the arms ofthe rotatable carrier 13, with theiraxes in alinement with the axes of the semi-circular ends 2l of theforming spool. Each of these elements 25 is secured in position von thecarrier b v means of bolts'26, and

`each has a rearwardly extending hub portion 27 ivhich fits Within anaperture in the rotatable carrier 13. shaft or pintle 28V is mounted inthe axial bore of each hub portion 27 in the element 25, the shaftbeingr provided with a head 29 occupying a eeni'rul countersunk recess3l in the outer tace ol the element 25. The 'front end ot each shaft 28is provided with an extension l2 upon which is mounted a spur gear 3ft.ldler `gears l5 are mounted upon shafts 3G which are passed through andmounted in operative position onthe rotatable carrier i3. The idlergears 35 constitute driving connections betvseen the stationary gear l5and the spur gears 34. coaxial with the senil-circular ends 2l oli thesupporting spool ll). rllhroiigh the arrangement of gears described, aplanetariY grenidrive is provided of such design that each spur gear andits shaft is caused to iiialteI one revolution about their axis duringiiy single revolution oil' the shaft 'l2 andy the rotatable carrier 13,the rotation ol" the earrier and the spool ll) carried thereby beinganti-clockwise, as viewed. in Fig. l, and the rotation of the shafts 2S,which are driven through the rotation of the carrier, being.I` clockwise(all as indicated in Figs. Si, 1i), v1l and l2).

A section of strip material to be bent or Wound edgewise is indicated ai40, 'it being intended that this material shall be bent or wound in sucha manner as to iorni the several tuins of a coil ot the shape ot theforni i9 and such as mayv be used Ator an electroniagnet for the lieldelement ol a dynamo-electric machine, or otherwise. )is indicated inFig. l, this strip material lll is bent around the semi-circular end 2lat the left of the forming spool, it being intended that the succeedingoperation will bend such strip material around the send-circular end 2lat the right ot the forming spool.

The front face oit each of the disk-shaped elements or forming blocks2l, is provided with a substantially circular recess all ha ving aninivardl)7 cut portion 45, the arrangement providing an annular shoulderLl-( and an outer boundaryv wall fli', the latter being recessed atdiametrically opposite points itl and 4f), as indicated, and the recessif) being extended at the leading side, considered with respect to thedirection of rotation of the element 25. A dish-sli:ii ed head al theouter end ot each oi the shafts 2d servesl as ay tool holder. Mounted ina recess in the outer tace of the tool holder 5l is :i holder 52 for acutting tool 53, t-lic liui` ot the cutting edge ot said tool beingdisplaced 'troni and substai'itially parallel to a radius through theaxis oit the shaft 28. The cutting edge of the tool 53 is displacedlroiii the i'roiil face of the disk-shaped element 25 h v means ot' anaxial projection 54 on the latter element and with which the tool holdereooperates to maintain the desired space between the parts.

The tool holder is likewise provided with a ll l) lltl lill) Leanserinsertion Within and removal troni the ro cess 56, the reduced extensionGil ot the shrunk portion passingy beneath the holder 52 :tor thecutting;1 tool, with the shoulder 64.- liniitino; the insertion ot theshank into the recess. The torniing tool 6l is provided with :i lat eralextension 6i", in a. recess in the lower tace of which a hardenedWearing plate GS is inounted. The outer end oit theshank portion 62terminates in a hook-shaped portion 69. The plate 68 is maintained atsuch a distance from the center ot rotation ot the shalt 28 that itbears forcibly against the outer side ot the strip material to he Woundon the semi-circular end 2lA ot the forming spool i9; and it is throughthe forcible bearing ot the Wearing plate 68 against the edge oi'v thestrip material that the latter is bent dur.' rotation of the formingtool about its anis. The shank portion 62 ot the torniingr tool is alsoprovided With a rear extension 7l having a projection 72 thereon. Whenthe tool holder is in operative position, the extension ll lits in thecircular recess t3, with. the projection 72 in the under-cut recess doand engaging against the shoulder t6 to prevent WithdIaWal of theforming tool in an axial direction. Likewise, the engagement ot theprojeetion 72 With the shoulder 416 limits the separation ot the innerside ot the shank portion from the `outer tace ot the eleinent Q5, thisdistance corresponding to the Width ot the strip material being Woundwith alloivance for increasing thickness during; the bendingoperation.The tormingrtool 6l can readily be removed in a radial direction tronithe operative position shovvn in Figs. 'l and 4t.

To appreciate the operation ot the process and apparatus, one can assumethat the ini-` 'former at theleft in Fig. It, or that the strip materialis otherwise held in position, and

r Y that the forming;` tool Gl has been inserted to operative positionwith respect to the shaft 28 and the portion ot the torni .lil at theright in Figs. 'l and 9.

lilindicates a. portion olf the strip material constituting a str: ightside ot the turn ot a coil beine' formed. In order to prevent distortion ot this straight portion of the turn duringr the succeedingVbendingr operation. a clamping device 75 is provided, the saineincluding a shank portion 76 rotatable in and readily insertible in andreinovable from an aperture in the boundary wall. i-.7 ol` theelcment ata point to the rearo't tlierecess i8 therein. This shank portion 76 isprorecess 7l" near its outer ene; and a clamping; block l having arecess provided with a curved *all closely engageable with that ot therecess 77, a pin 79 being provided to hold the clamping block inoperative position in the recess. ills will he apparent from thedrawings, roti yion ot the shank or stein 76, as by applyinga tool tothe screw head thereolil will. cause the loiver straight clainpingr edgetl() ol the clamping` block to be reeiprocated to and troni toi-cibleengagement with the odn'e ot' the straight portion 74e ot the coil turn.`When the claniping device is in operative position. 4as indicated, thestraight sides ot the coil are prevented troni liulgring or distortingoutwardly.

lill'ith the clamp l5 in operative engaging position and the torininp;tool. (il inserted to operativo position and held therein by the pin6.3, as indicated in Figs, l. and 9, the nir-chine may be started. lnoperation, the carrier lil rotates in an anticlockivise direc tion, andthrough the planetary drive, the torn'iing; lool til and the cuttingtool53 are driven in a clockwise direction about their axis ot rotation. TheoperatingI eillect is that as thc carrier rotates troni theposition in*ilicatcd in Fig. t) to that indicated in l0, the lorniing tool 6l causesthe strip material il() to be bent around the seiniecircular end 2l oitthe forming block or spool; and when the carrier is in a positionindicated in Fig. l0, the strip material el() has been bent throughapproximately 90 degrees. During the bende ing' operation described.lthe thickness of the material has increased adjacent the inner edgethereof at the bent portion. Because of the forcible engagement betweenthe shank of the bending; tool and the enlarged bent niaterial, andprobably sonic holding action ot the cutting tool. 53 which 'follows thetorining tool. substantially all oit this increase in thickness appearsat the outer tace olf the bent strip material. J ust prior to theinoinent the parts have assumed thc positions indicated in Fig. l0, thecutting tool has started its cuttii'u;` or shavingoperation7 its ctlcctbeing to rcinove any prcriously lforined excess thickness at the bentportion and thus cause the thickness at the bent portion `to be uniformand ot the desired dimension. 'The cutting1 action is one oli shearingor shaving. as will be apparent 'troni lling il.. wherein tho action ot'the cutting lool 53 in removing; the portion 41037' lll) bend and, nowbeing opposite the recess Li9, may beremoved from operative position soas to prevent distortion of the straight portion of thev coil side, asmight be produced by further rotation of the forming tool relative totheformiiig spool. Accordingly, lthe forming tool 61 is withdrawn in aradial direction through ther recess A19. At this f timegthe recess t8in the disk 25 at the right hand sidefot the forming spool 19, l in Fig.11, is iii position wherein the forming tool 61 recentlyi'emoved fromthe disk 25 at the left, or' an additional forming tool (31,inay

V of the straight sided portion 7a of the coil, .Y ythis clamping devicemay be removed, as i indicated in Fig. 11.

. From they position indicated vin Fie. 11, rotationof thevcarrier plate13 and its ap- Ypurtenant parts may be continued through the position ofFig. 12 and` to a positionV "corresponding to that of Fig. 9.

During ythis operation of the carrier 13 through 180 degrees, asecondsemi-circular bend is produced in the strip material to form theopposite end of an oval-shaped'turn of the coil being formed. Duringthis operation, a portion of this semi-circular bend has had its excessthickness reinoved from the inner edge thereof, the remainderof thisexcess material being removed as thecarrier is rotated Y furthenfrom thepositionof Fig. 9 to that of Fig. 10.

y Y Due to the fact that the bending and cuttingtools rotate on theiraxis at the saine angular, speed as and in a direction opposite to therotation of the carrier 13, the bending and cutting tools always extenlin the saine directions in space.

As each semi-circular bend is formed, the lower side of the bend,considering Fig. 11,

mayl inove outwardly or forwardly into proximity with the previouslyforn'ied turns, as the carrier rotates'to the position of Fig.

'12 and` slightly beyond, the cutting tool at this latter time havingcompleted its cuttingV or shaving operation and occupying a position.within the formed portion of the coil, as may be seen at the right inFigs. 9 and 11, and hence not preventing this forward moveinent'of thecoil side or the formed coil end.

Thus, it will be apparent that as the portions of they coil arecompleted they are free to move automatically or to be moved forwardlyfrom the disk 25 so as to permit the formation of a succeeding bend orturn about the forming spool.

Y the clutch is released,

Leanser In order to insure a sufficient interval of time to provide forthe removal of the forining tool G1 from one end of the carriersuhsequent to the completion of a seini-circul ar bend, and theinsertion of this tool, or the insertion of another tool, at theopposite end of the forming spool, it is desirable to provide for theautomatic stopping` of the apparatus when the bends are completed, atwhich time the recesses 49 and Li8 come into position to permitreinovalof one forming tool and the insertion of another forming tool.

As indicated in the drawings, Fig. 13, a. 'worm gear 8l operated by aworm 82 may serve as the operating drive for the shaft 12. The shaft 83of the worin 82 is driven from a shaft 84; operated by a motor 85,directly or through a belt drive, as indicated, a clutch 86 beingprovided between the shafts 82 and 83 the movable part of the clutchbeing pro- `vided with a pin 8T operating in a cam slot 89 of aclutch-operating element 91 having a guided reciprocating movement in adirection perpendicular to the axis of the shaft 83, the operatingelement 91 being normally biased by a spring 92 to a position whereinThe clutch parts are held engaged to provide an operating drive for .theshaft 12, by reason of the fact that the operating element 91 is held inthe position shown by a catch 93 which is flexibly connected to theclutch-operating element 9L through a liexible wire or the like 9-lpassing over a sheave 94, the catch 93 being held by a latch 95, shownin Figs. 2 and 13 in the forni of a bell-crank lever and preferablyprovided with a. pin or roller 95" at that end which engages the catchThis latch 95 is pivoted on a bracket carried by a stationary arm 9Gcarried bythe hub of the fixed gear 15, a spring 97 serving to bias thelever to latching position relative to the catch 93. An arm 98 ismounted on the shaft 12 for rotation therewith, extending in oppositediiections from the shaft, and is provided with operating portions 99 atdiametrieally opposite points and in position to engage with and tripthe latch 951 preferably through engagement with the pin or roller 95"lon the end of the latch, as the parts of the bending apparatus reach orpass beyond the position indicated in Fig. 13, the position of the parts in this figure being that assumwl just prior to reaching thepositions of Figa 9 and ll. Releasing of the latch by he operatingportion 99 of the arm. 98 permits the operating spring 92 to actuate theoperating element91, thus releasing the clutch and causing the rotatablecarrier 125 and its appurtenant parts to stop immediately due to its ownload or, if necessary or desired. the additional load of an appliedbrake. The catch 93 is preferably mounted on a reciproeating rod 100which is constrained to the desired straight line movement by suitableguides a theretor mounted on `the stationary arm 96.

The apparatus may be started again by applying.;` pressure to a treadlelOl, causing the catch 93 to be draven down and the preventing upwardmovement thereoiI and,

consequent release olf the clutch and the driving connection to thecarrier 13.

ln ordeil to insure that no damage may be done to the coil being:toi-med, even though the operator Ytails toA remove the forming tool Glas the latter reaches the position ot Fig. ll, an eye is suspended inposition wherein its cross bar will be engaged by the hook portion G9 etthe forming tool as the tool holder tends to rotate beyond the positionof Fig. lll, the forming tool being suspended on the eye and ireeing andreleasing itself from the element 25 as the latter continues itsrotation, the enlargement ot the recess i9` tacilitating the removal ofthe bending tool.

ln the operation et the apparatus, it is preferable that sections oitstrip material be ted from spools and joined together mechanically andelectrically before being supplied to the bending apparatus, so that theoperation oit the rotatable carrier 13, `with its forming spool andbending and cutting tools, may proceed untilthe requirednumber of turnsare formed to complete the total number ot coils required. As therequired number ot turns per coil are formed and moved Aloiwvard on theforming spool, the Wound material may be cut at the proper point topermit ren'ioval oit a completely formed coil ot the desired number otturns.

Vilhile the invention has been described herein in connection with theformation of turns or coils otgenerally oval-shape with semi-circularbends, it will be apparent that 'features ot present invention may beutilized in the formation et coils ot any other shape, such as generallycircular, triangular, lrectangular, with 360, and 90 degrees connectingbends, respectively, such coils being termed expeditiously when thebending tools are given the required operation as described andsuggested herein.

lt will be apparent that, in accordance with the process and apparatusof the presont invention all excess thickness termed during thebendingor Windingoit strip material may be removed during the operationot bending the material, and the final product may be a turn or a serieset turns torining a coil .vherein the strip material is ot substantiallythe saine thickness throughout.

it should be understood that the inven- .A tion claimed is not limitedto the enact details of construction and operation shown and describedherein, tor obvious modications will occur to a person skilled in theart.

It is claimed and desired to secure by Letters Patent:

l; ln apparatus tor bending strip material, the combination of a forni,and means .tor accomplishingl a combined bending andtliiclniess-reducing operation on said material, said means and saidtorni being relatively movable, Vand said means being op erative duringa continuous increment ot relative movement to form the desired bendabout said rl'orm While permitting increase in thickness of the stripmaterial at its inner edge during actual bending ot' such material andto reduce the excess thiol-:ness et said material at all portionstliereoi produced during such bending. j

2. In apparatus tor bending strip material, the combination of a term,and an element provided With a bending device and a thiclniess-reducingtool, said iorm and said element being relatively movable, saidelementbeing operative during a continuous increment ot said relativemovement to cause said bending device to bend said material about saidterm and to cause said thickness-reducing tool to remove excessthickness tormed during the bending thereof from all parts thereofadjacent the bent portion.

3. In apparatus for bending strip material about a form, means Yforproducing relative rotation between the form and the strip material tocause the latter to be bent to the desired shape While permittingincrease in thickness ot the strip material at its inner edge duringactual bending ot such material, and means operable during said bendingoperation and during a continuous increment o'l" saidV relative rotationtor re ducing excess thickness of all thickened parts adjacent the bentportion of said ma terial.

fl. lin apparatus for bending strip material about a form, means forproducing relative rotation between the form and the strip materialtocause the latter to be bent to the desired shape While permittingincrease in thickness ot the strip material at its inner edge duringactual bending of such material, and means rotatable during said bendingoperation and during a continuous increment ot said rotation forreducing all ot the excess thickness adjacent the bent portion ot saidmaterial.

5. In apparatus lor bending strip material, a rotatable carrier, a tornimounted on said carrier and about which strip material may be bent, anda bending element cooperative with said strip material. and operative tobend said material about said form during rotation of* said carrier, andmeans operative during the rotation of said carrier les izoV

for removing excess material from the bent portion of said stripmaterial.

6. In apparatusffor bending strip material, a rotatable carrier,a formmounted on said carrier and about which strip material maybe bent, abending element carried by andY rotatable'relative to said carrier andcooperative With said strip material to bend the latter about said yformduring rotation of the carrienand means operative. during the rotationVof said carrier for removing eX- cess material'from the bent portion ofsaid strip material.

In apparatus for bending strip mate` rial, a rotatable carrier, a formmounted on saidy carrier and about `Which strip Vmaterial may be bent',a bending element cooperative with said strip material and operative tobend said material about said'form during 'rotation ofsaid carrier,andmeans carried byand rotatable relative to said carrier during theoperation of the latter for removing'excess thickness from the bentportion of said material.

SIn apparatus for bending strip lmaterial, a rota-table carrier, a formmounted on said carrier and aboutwhich strip material may be bent, abending element carried by and rotatable relative to said carrier andcooperativefwvith said strip material to bend the "latter about saidvform during rotation of the carrier, and means carried by androtatablerelatifve toy said carrier during the operation of tlie'latterfor removing excess thickness fromV the bent portion of said material.

"9. ln apparatus for bending strip mate rial Vinto a series of separatebent portions, a form, a bending` element cooperative with said materialand adapted to bend the latter about said form, and means inherentlyop-V erative to remove Yfrom each Vbent portion the excess thicknessthereof prior to the formation vof a succeeding bent portion of saidmaterial. c

10. vln'appara-t-us for bending strip material into ai series ofseparate bent pon tions, a carrier, a form mounted on said carriei', aVbending element mounted on said form cooperative With said material tobend ythe latter about said form, and means inherently operative. toremove from leach bent portion of the .material the excess thicknessthereof Vprior to the formation of a suc'c'ee'dingbent portion.

V'11. In apparatus Vfor bending stripmaterial into a series of separatebent portions, a/carrier, a form mounted on said carrier, a bendingelement mounted on said form and cooperative with said vmaterial to bendthe latter about Vsaid form, and means inherently operative `to removefrom each bent portion of the material the excess thiclrnesslthereofprior tti the formation of asucceedingfbent portion, said means conrifetaeer prising a cutting tool rotatably mounted on said carrier.

12. In a machine for winding strip material edgeivise, a rotatable formabout which material may be bent to form complete turns, a bendingelement cooperative with the material and rotatable about said formduring rotation of the latter to cause the material to bent to thedesired shape, and a tool rotatable relative to said form and adapted toremove excess thickness from the inner edge of the bent portion.

13. In a machine for winding strip ma terial edgeivise, arotatable formabout which material may be bent to form complete turns, a bendingelement cooperative n'ith the material and rotatable about said fornitocause the material to be bent to the desired shape, and a tool rotatablein a di rection opposite to that of said form and adapted to removeexcess thickness at the inner edge of the bent portions.

14. In a machine forwinding strip material edgewise, a form about whichthe material may be bent to form con/iplete turns, a bending elementcooperative with the ma terial and rotatable about said form to causebending of said material to the desired shape, and a cutting toolrotatable relative to said form and adapted to remove excess thicknessformed at the inner edge of the bent portion of the material through amovement which is partly in continuation of the movement of said bendingelement, the cutting edge of said tool being at an angle to a radiusthrough said cutting edge and thc center of rotation of said tool.

15. In a machine for Winding strip material edgeWise, a rotatable formabout which material may be bent to form complete turns, a bendingelement cooperative with the material and rotatable about said form tocause the material to be bent to the desired shape, and a cutting toolrotatable in a direction opposite to that of said form and adapted toremove excess thickness at the inner edge of the bent portion, thecutting edge of said tool being rearwardly inclined.

16, In apparatus for Winding strip material edgewise, a rotatablenon-circular form having spaced portions of arcuate contour, a. tool forbending said n'iatcrial about said forni during rotation of the latter,a thickness-reducing tool rotatable about an arcuate portion of saidform, and a planetary gear drive connection between said form and saidthiclmess-reducing tool to cause rotation of the latter relative to saidform. said thicknessredueing tool being adapted to remove excessthickness at the inner edge of the portion of the material bent aboutsaid arcuate portion.

17. ln an apparatus for Winding strip material edgew'ise, a rotatablenonscircular lll) lim

form having spaced portions ot substantially bend the material about asemi-circular porcircularcontour, a bending tool cooperative With saidmaterial to bend the latter about said form, a cutting tool rotatableabout the axis of a circular portion ot said term, and

a planetary gear drive connection between said form and said cuttingland bending tools to cause rotation of the latter relative to said iorm,said cutting tool being` adapted to remove excess thickness at the inneredge of a port-ion ot the material bent about said circular portion ofsaid form.

18. In a power-driven machine for bending strip material edgevvise, arotatable carrier, a non-circular term carried thereby and having aplurality ot arcuate portions connected by substantially straightportions, a bending tool having a portion cooperative with the edge o'tthe material to be bent, a cut-ting tool cooperative with the bent por--tion ot said material and adapted to remove excess thickness thereotduring rotation et said carrier, `and a driving connection between saidrotatable torni and said bending and cutting tools.

19. ln a machine for bending strip material, a rotatable form ot thedesired shape ot bend, a bending tool cooperative with said material andadapted to bend the material about said form, a cutting tool adapted toremove excess thiclrness adjacent the inner edge ot' a bent portion ofsaid material, means tor producing relative rotation between saidbending` and cutting tools and said form, and means for insuringretention ot said bending tool in operative position during the bendingoperation and permitting removal ot saidtool only on completion ot saidbending operation.`

20. An edgewise Winding machine, coinprising, a rotatable carrier, atorni mounted on said carrier and about Which strip material may be bentto form an edgewise 'Wound coil, and a bending element coopera tive withsaid strip material and operative to bend said material about said tornidui ing rotation of said carrier.

2l. In apparatus for forming coils ot' strip material, a rotatablesupport, a term mounted on vsaid support and rotatable relative to thestrip material ted thereto, and a bending tool carried by said supportand rotatable relative thereto and cooperative with said material duringrotation ot said term to bend the material about said term.

22.1n apparatus for forming coils ot strip material, a rotatablesupport, a torni comprising straight portions connected by semtcircularends mounted on said support and rotatable relative to the stripmaterial ted thereto, and a bending tool carried by said support androtatable relative thereto in an angularly opposite direction, saidbending tool being` cooperative With said material during rotation otsaid :torni to tion ot said torni.

23. ln apparatus for 'forming coils of strip material, a rotatablesupport, a form mounted on said supportand rotatable relative to thestrip material ted thereto, and a bending tool carried by said supportand rotatable relative thereto and cooperative with said material duringrotation ot said i'orm to bend the material about said forni, therelative rotation ot said bending 'tool being in a direction opposite tothat ot said support and at substantially the same speed as the latter.

rlhe combination in a Winding machine, oit a rotatable non-circular formof delinite shape, a bending tool, and means stantially coincident withthe center o'tV curvatine ot the curved portion et said torni andcooperative with said strip material to bend the same about said curvedportion during rotation ot said carrier.

2G. ln a machine tor Winding metallic strip material edgewise in theform ot a coil, a rotatable carrier, a torni mounted thereon and havinga peripheral contour which is composed ot straight sections and curvedsections, a removable device constituting a combined guide torpreventing buckling ot' said strip material and for bending saidmaterial about curved portions ot said form, and means lor rotating saiddevice in direction opposite to that ot' said torni to cause the bendingot the strip material about a curved portion ot said form While permit`ting rendering said device inoperative during the laying ot straightportions ot a Wound coil.

27. ln a machine tor bending strip material, a rotatable torni oit thedesired shape et bend, a bending tool cooperative with said material andadapted to bend the material about said term, means tor producing relative rotation between said bending tool and said torni, and means 'l'orinsuring retention oi said bending tool in operative position during thebending operation while nermilting removal ot said tool on completion otsaid bending operation.

fln a power-driven machine 'l'or Winding strip material edgewise, arotatable carrier, a :torni carried thereby and having a curved portion,a bending tool cooperative rial about thev curved portion ot said formand mounted for rotation and axial adjusty ment with its airis ofrotation substantially ioA concident With the center of curvature ofsaid curved portion of theform, and a power connection between saidcarrier and saidbending tool to cause the latter to be rotated at anangular speed equal to that of said carrier and in a direction oppositeto that of said carrier.

2 9. ln a machine for bending strip niate rial edgevvise, a rotatablecarrier, a term cariied thereby and having a portion ot arcuate.contoui, a bending tool cooperative with the edge ofthe material to bebent, said bend- Y ing tool heingvi'otatable relatively to said formtocause lsaid material to be bent about said arcuate portion ot' theform, a power connection between said carrier and said bending tool tocause rotation ot the latter, and means for causing `stoppage ot' saidcarrier on completion of a bend.

30. In a machine tor bending strip material edgevvise, a rotatablecarrier, a non-cin cular forni carried thereby and having a plurality ofbent portions connect-cd by substantally straight portions, a bendingtool'cooperative ywith the edge ot' the material to be bent,fsad bendingtool being rotatable relatively to said form to cause said material t0be bent about said form, a power connection between said carrier andsaid bending tool to cause rotation of the latter, and means for causingremoval of said bending tool `trom-operative position upon thecompletion of a bend in said material.

SLln a power-driven machine for bending strip material edgewise, arotatable car-` rier, a non-circular form carried thereby and having aplurality ot bent portions connected by substantially straight portions,a bending tool cooperative With the edge of the material to be bent andwith a side thereof tovholdthe latter against an abutment, said bendingtool being rotatable relatively to said form to cause said material tobe bent about the torni, a povver connection from said carrier to saidbending tool to cause rotation of the latter, means for insuringretention otsaid bending tool in operative position luntil thecompletion of a bend in said material While permitting removal of 'saidtool upon completion ot' said bend, and

means for causingreinoval ot' said bending tool from ope V'ativeposition upon the coinplet-ion of said bend.

vaboutthe circular portion of said torni, a Vthiclmess.-reducing tooladapted to remore excess thickness from said material bent about saidcircular portion ot the form, said bending` and thickness-reducing toolsbeing mounted ior rotation about the axis ot said circular portion ofthe l'orm, and means for rotating said tools at an angular speed equalto that of said carrier and in a direction opposite to that ot saidcarrier.

Y 33. ln apparatus for producing coils formed of strip material, arotatable forni having portions ot' curved contour. and means associatedwith said iorin and rotatable relatively thereto and during rotationthereot' and adapted to reduce excess thickness of the overlying curvedportions ot' the coil successively.

254i, lin a machine for Winding strip material, a rotatable torni, meansi'or feeding material to and bending the same about said form, andmeans` continuously operiitive relative to and during the rotation ofsaid forni and the operation oi `bending said material and adapted toremove excess thickness formed at the inner edge of the bent portion oithe material.

35. The combination of means tor bending and winding strip materialedgewise at delinite inter vals whereby a coil of noncircular shape isproduced, and means operating concurrently with the bending operation tomaintain uniformity ot cross section throughout the material of theshaped coil, said latter means including a cutting tool adapted to shaveall ot the excess thickness from the inner edge ot a bent portion oi theshaped coil through an operation which is continuous with the bendingoperation.

5G. The combination ot a non-circular coil form, a bending elementmovable peripherally abouti a portion oit said torni and adapted todispose strip material in desired bent shape about said portion oit saidforni, means for'teinporarily holding a portion ot said strip materialin place, means for removing excess thickness from a bent portion otsaid material in advance ot' a succeeding traverse of said bendingelement, and means for supporting formed and reduced turns ot said coil.

37. An improvement in the art ot `forming bent material subject toincrease in thickness during the bending operation, which coniprisesbending said material and removing by an operation continuous with thebending operation all ot' the excess thickness produced adjacent thebend during the bending operation.

88. Ain improven'ient in the ait of producing bent strip materialsubject to increase in thickness during the bending operation, whichcomprises bending said material While one tace thereof is forcibly heldby a traveling element against an abutment, and removing through anoperation which is continuous With the bending operation all of theexcess thickness of the material prollll iii

duced at the opposite vtace thereof during the bending` operation.

39. An improvement in the art of pro# ducingcoils ot strip materialsubject to increase in thickness during the bending operation, whichcomprises bending` said inaterial about a torni to complete a turn andren'ioving troni said bent material excess thickness at all thickenedportions thereot' through an operation which is continuous with thebending` operation.

it fin iniijiroveinent in the art oi' producingl coils having,` aplurality of turns oit strip material bent edgewise and subject to'increase. in thickness dining; the bending operation, which comprisesbending said material about a torni 'to eon'ipiete the turnssuccessively, and removing` from one iaee olf the bent portions of saidturns excess thickness troni allpoi.'tioiis thereof through an operationwhich is continuous `with the bendingl operatioii.

ll. ln a niaehiine tor bending strip inaterial edgewise.. a non-circulartorni having a curved portion and rotatable about a single axis, abending.; tool Cooperative with strip material to be bent, and ineansfor rotating said bending tool about the curved portion of said form 'tocause said tool to bend said material to desired shape about said curvedportion of the torni during rotation ot said Ytorni. I

412. in av machine for bending strip inaterial edgewise, a lforinhaving` a plureiity of arcuate portions connected by a substantiallystraight portion and rotatable about a single axis, a bending toolrota-table about an areuate portion of said torni and cooperative withthe strip material to be bent, and means il'or rotating said beinlinptool about said arcuate portion of said torni to bend said material tothe shape olf' said arcuate portion during;v rotatioi'i ot said torni ina direction opposite to the direction ot rotation oi said bending tool.

in testimony whereof, the signature ot the inventor aiiied hereto.

W'ILLIAM C. FURNA t5.

CERTHMCATE CURRECWN Patent No, 1,655,997, Gran'z January MP, 1928, to

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M, Moore, Seal. Commssmer of Patents.

